| /* |
| * Copyright (C) 2006 Lars Knoll <lars@trolltech.com> |
| * Copyright (C) 2007-2009 Torch Mobile, Inc. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| * |
| */ |
| |
| #include "config.h" |
| #include "TextBreakIterator.h" |
| |
| #include "PlatformString.h" |
| #include <wtf/StdLibExtras.h> |
| #include <wtf/unicode/Unicode.h> |
| |
| using namespace WTF::Unicode; |
| |
| namespace WebCore { |
| |
| // Hack, not entirely correct |
| static inline bool isCharStop(UChar c) |
| { |
| CharCategory charCategory = category(c); |
| return charCategory != Mark_NonSpacing && (charCategory != Other_Surrogate || (c < 0xd800 || c >= 0xdc00)); |
| } |
| |
| static inline bool isLineStop(UChar c) |
| { |
| return category(c) != Separator_Line; |
| } |
| |
| static inline bool isSentenceStop(UChar c) |
| { |
| return isPunct(c); |
| } |
| |
| class TextBreakIterator { |
| public: |
| void reset(const UChar* str, int len) |
| { |
| string = str; |
| length = len; |
| currentPos = 0; |
| } |
| virtual int first() = 0; |
| virtual int next() = 0; |
| virtual int previous() = 0; |
| int following(int position) |
| { |
| currentPos = position; |
| return next(); |
| } |
| int preceding(int position) |
| { |
| currentPos = position; |
| return previous(); |
| } |
| |
| int currentPos; |
| const UChar* string; |
| int length; |
| }; |
| |
| struct WordBreakIterator: TextBreakIterator { |
| virtual int first(); |
| virtual int next(); |
| virtual int previous(); |
| }; |
| |
| struct CharBreakIterator: TextBreakIterator { |
| virtual int first(); |
| virtual int next(); |
| virtual int previous(); |
| }; |
| |
| struct LineBreakIterator: TextBreakIterator { |
| virtual int first(); |
| virtual int next(); |
| virtual int previous(); |
| }; |
| |
| struct SentenceBreakIterator : TextBreakIterator { |
| virtual int first(); |
| virtual int next(); |
| virtual int previous(); |
| }; |
| |
| int WordBreakIterator::first() |
| { |
| currentPos = 0; |
| return currentPos; |
| } |
| |
| int WordBreakIterator::next() |
| { |
| if (currentPos == length) { |
| currentPos = -1; |
| return currentPos; |
| } |
| bool haveSpace = false; |
| while (currentPos < length) { |
| if (haveSpace && !isSpace(string[currentPos])) |
| break; |
| if (isSpace(string[currentPos])) |
| haveSpace = true; |
| ++currentPos; |
| } |
| return currentPos; |
| } |
| |
| int WordBreakIterator::previous() |
| { |
| if (!currentPos) { |
| currentPos = -1; |
| return currentPos; |
| } |
| bool haveSpace = false; |
| while (currentPos > 0) { |
| if (haveSpace && !isSpace(string[currentPos])) |
| break; |
| if (isSpace(string[currentPos])) |
| haveSpace = true; |
| --currentPos; |
| } |
| return currentPos; |
| } |
| |
| int CharBreakIterator::first() |
| { |
| currentPos = 0; |
| return currentPos; |
| } |
| |
| int CharBreakIterator::next() |
| { |
| if (currentPos >= length) |
| return -1; |
| ++currentPos; |
| while (currentPos < length && !isCharStop(string[currentPos])) |
| ++currentPos; |
| return currentPos; |
| } |
| |
| int CharBreakIterator::previous() |
| { |
| if (currentPos <= 0) |
| return -1; |
| if (currentPos > length) |
| currentPos = length; |
| --currentPos; |
| while (currentPos > 0 && !isCharStop(string[currentPos])) |
| --currentPos; |
| return currentPos; |
| } |
| |
| int LineBreakIterator::first() |
| { |
| currentPos = 0; |
| return currentPos; |
| } |
| |
| int LineBreakIterator::next() |
| { |
| if (currentPos == length) { |
| currentPos = -1; |
| return currentPos; |
| } |
| bool haveSpace = false; |
| while (currentPos < length) { |
| if (haveSpace && !isLineStop(string[currentPos])) |
| break; |
| if (isLineStop(string[currentPos])) |
| haveSpace = true; |
| ++currentPos; |
| } |
| return currentPos; |
| } |
| |
| int LineBreakIterator::previous() |
| { |
| if (!currentPos) { |
| currentPos = -1; |
| return currentPos; |
| } |
| bool haveSpace = false; |
| while (currentPos > 0) { |
| if (haveSpace && !isLineStop(string[currentPos])) |
| break; |
| if (isLineStop(string[currentPos])) |
| haveSpace = true; |
| --currentPos; |
| } |
| return currentPos; |
| } |
| |
| int SentenceBreakIterator::first() |
| { |
| currentPos = 0; |
| return currentPos; |
| } |
| |
| int SentenceBreakIterator::next() |
| { |
| if (currentPos == length) { |
| currentPos = -1; |
| return currentPos; |
| } |
| bool haveSpace = false; |
| while (currentPos < length) { |
| if (haveSpace && !isSentenceStop(string[currentPos])) |
| break; |
| if (isSentenceStop(string[currentPos])) |
| haveSpace = true; |
| ++currentPos; |
| } |
| return currentPos; |
| } |
| |
| int SentenceBreakIterator::previous() |
| { |
| if (!currentPos) { |
| currentPos = -1; |
| return currentPos; |
| } |
| bool haveSpace = false; |
| while (currentPos > 0) { |
| if (haveSpace && !isSentenceStop(string[currentPos])) |
| break; |
| if (isSentenceStop(string[currentPos])) |
| haveSpace = true; |
| --currentPos; |
| } |
| return currentPos; |
| } |
| |
| TextBreakIterator* wordBreakIterator(const UChar* string, int length) |
| { |
| DEFINE_STATIC_LOCAL(WordBreakIterator, iterator, ()); |
| iterator.reset(string, length); |
| return &iterator; |
| } |
| |
| TextBreakIterator* characterBreakIterator(const UChar* string, int length) |
| { |
| DEFINE_STATIC_LOCAL(CharBreakIterator, iterator, ()); |
| iterator.reset(string, length); |
| return &iterator; |
| } |
| |
| TextBreakIterator* lineBreakIterator(const UChar* string, int length) |
| { |
| DEFINE_STATIC_LOCAL(LineBreakIterator , iterator, ()); |
| iterator.reset(string, length); |
| return &iterator; |
| } |
| |
| TextBreakIterator* sentenceBreakIterator(const UChar* string, int length) |
| { |
| DEFINE_STATIC_LOCAL(SentenceBreakIterator, iterator, ()); |
| iterator.reset(string, length); |
| return &iterator; |
| } |
| |
| int textBreakFirst(TextBreakIterator* breakIterator) |
| { |
| return breakIterator->first(); |
| } |
| |
| int textBreakNext(TextBreakIterator* breakIterator) |
| { |
| return breakIterator->next(); |
| } |
| |
| int textBreakPreceding(TextBreakIterator* breakIterator, int position) |
| { |
| return breakIterator->preceding(position); |
| } |
| |
| int textBreakFollowing(TextBreakIterator* breakIterator, int position) |
| { |
| return breakIterator->following(position); |
| } |
| |
| int textBreakCurrent(TextBreakIterator* breakIterator) |
| { |
| return breakIterator->currentPos; |
| } |
| |
| bool isTextBreak(TextBreakIterator*, int) |
| { |
| return true; |
| } |
| |
| TextBreakIterator* cursorMovementIterator(const UChar* string, int length) |
| { |
| return characterBreakIterator(string, length); |
| } |
| |
| } // namespace WebCore |